Irrigation Water Management: Irrigation Scheduling













Table of Contents


Training manual no. 4

a manual prepared jointly

by

C. Brouwer
International Institute
for Land Reclamation and Improvement

and

K. Prins
consultant
M. Heibloem
FAO Land and Water Development Division

The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.

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© FAO 1989

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Table of Contents


PREFACE

ABOUT THIS PAPER

ACKNOWLEDGEMENTS

CHAPTER 1: INTRODUCTION

CHAPTER 2: THE INFLUENCE OF WATER SHORTAGES ON YIELDS

2.1 Which Crops are Sensitive to Water Shortages
2.2 Which Growth Stages are Sensitive to Water Shortages

CHAPTER 3: DETERMINATION OF THE IRRIGATION SCHEDULE FOR CROPS OTHER THAN RICE

3.1 Plant Observation Method
3.2 Estimation Method

3.2.1 Estimating the Irrigation Schedule
3.2.2 Adjusting the Irrigation Schedule

3.3 Simple Calculation Method

3.3.1 Application of the Simple Calculation Method
3.3.2 Adjusting the Simple Calculation Method for the Peak Period
3.3.3 Calculation Example Irrigation Scheduling

3.4 Conversion of mm/day into litres/sec.ha
3.5 Adjusting the irrigation schedule to actual rainfall

CHAPTER 4: DETERMINATION OF THE IRRIGATION SCHEDULE FOR PADDY RICE

4.1 Introduction
4.2 Growing Paddy Rice
4.3 Rice Growth Stages
4.4 Irrigation water need of paddy rice
4.5 Irrigation scheduling of paddy rice

Annex I: Irrigation efficiencies

Annex II: Rainfall measurement*

Annex III: Datasheet: determination of irrigation water need of paddy rice

Suggested further reading